﻿Module CommonUtils



    Public Function isNullString(ByVal str As String) As Boolean
        If IsNothing(str) Or str = vbNullString Or str = "" Then
            Return True
        Else
            Return False
        End If
    End Function

    Public Function isNotNull(ByVal str As String) As Boolean
        Return isNullString(str) = False
    End Function

End Module
